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This is the master POM file for Oracle's Implementation of the JSF 2.1 Specification.
There is a newer version: 2.1
/*
 * $Id: MethodExpressionValidator.java,v 1.7 2007/04/27 22:00:11 ofung Exp $
 */

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
 * Contributor(s):
 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
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 */

package javax.faces.validator;

import javax.el.ELContext;
import javax.el.ELException;
import javax.el.MethodExpression;
import javax.faces.application.FacesMessage;
import javax.faces.component.StateHolder;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;

/**
 * MethodExpressionValidator is a {@link Validator} that
 * wraps a {@link MethodExpression}, and it performs validation by executing
 * a method on an object identified by the {@link MethodExpression}.
 */

public class MethodExpressionValidator implements Validator, StateHolder {

    // ------------------------------------------------------ Instance Variables

    private MethodExpression methodExpression = null;

    public MethodExpressionValidator() {

        super();

    }

    /**
     * Construct a {@link Validator} that contains a {@link MethodExpression}.
     */
    public MethodExpressionValidator(MethodExpression methodExpression) {

        super();
        this.methodExpression = methodExpression;

    }

    // ------------------------------------------------------- Validator Methods

    /**
     * @throws NullPointerException {@inheritDoc}
     * @throws ValidatorException   {@inheritDoc}
     */
    public void validate(FacesContext context,
                         UIComponent component,
                         Object value) throws ValidatorException {

        if ((context == null) || (component == null)) {
            throw new NullPointerException();
        }
        if (value != null) {
            try {
                ELContext elContext = context.getELContext();
                methodExpression.invoke(elContext, new Object[]{context, component, value});
            } catch (ELException ee) {
                Throwable e = ee.getCause();
                if (e instanceof ValidatorException) {
                    throw (ValidatorException) e;
                }
                String errInfo = ee.getMessage();
                FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_ERROR,
                                                        errInfo,
                                                        errInfo);
                throw new ValidatorException(message, ee.getCause());
            }
        }

    }

    // ----------------------------------------------------- StateHolder Methods


    public Object saveState(FacesContext context) {

        Object values[] = new Object[1];
        values[0] = methodExpression;
        return (values);

    }


    public void restoreState(FacesContext context, Object state) {

        Object values[] = (Object[]) state;
        methodExpression = (MethodExpression) values[0];
    }


    private boolean transientValue = false;


    public boolean isTransient() {

        return (this.transientValue);

    }


    public void setTransient(boolean transientValue) {

        this.transientValue = transientValue;

    }

}